Consolidated Statements of Shareholders' Equity (Parenthetical)	12 Months Ended
	Dec. 31, 2018 $ / shares shares	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 $ / shares shares
Cash dividends paid on common shares, per share | $ / shares	$ 0.47	$ 0.44	$ 0.41
Issuance under equity compensation plans, shares	157,882	174,895	213,234
Stock Issued During Period, Shares, Conversion of Convertible Securities	0	0	0
Total shares awarded to JCB shareholders	0	3,299,864	0